I bought a pair of bicycle pedals that to my surprise had no notches on the pedal spindle to use when tightening them. I managed to screw them in by hand, but they are not quite tight since I can't use a spanner on them. So what would be the correct way to tighten them? Are there any special tools or similar that I'm supposed to use?
The offending pedals can be seen below. The spindle is, as you can see, completely smooth.